| 摘要 |
In a frictional hinge device, a diameter-increased section 11 of a rotation shaft 10 is formed so that the surface roughness (Ra) is 0.05~0.20 mum in the circumferential direction, and the surface roughness (Ra) in the axial direction is 0.15~0.30 mum. A relationship between a deviation "P-P" and an innermost dent V is defined as P-P<2.5 mum and V<1.0 mum. With the use of synthetic resin (PC, PAR, PPS, e.t.c.), a support block 20 is provided integrally around the rotation shaft 10. The support block 20 tightly engages with the rotation shaft 10 due to a residual stress based on a shrinkage allowance appeared when molding the synthetic resin. With a good deviation "P-P", a shallower innermost dent V and a smaller surface roughness in the circumferential direction, a stable surface friction is maintained for an extended period time with the least amount of wear. By making the surface roughness (Ra) in the circumferential direction smaller by 0.1~0.2 mum than the surface roughness (Ra) in the axial direction, the stable torque is positively insured with no initial scratch and no stickslip.
|
